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AASHTO TP 57-06
- Standard Method of Test for The Qualitative Detection of Harmful Clays of the Smectite Group in Aggregates Using Methylene Blue
- standard by American Association of State and Highway Transportation Officials, 01/01/2006
- Publisher: AASHTO
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The purpose of this standard is to identify the presence of harmful clays of the smectite group (poor quality 75-m material) and to provide an indication of the surface activity of the aggregate.